Compressor.



R. CONRADER,

COMPRESSOR. APPLICATION FILED MAY 4, I915.

Patented Sept. 11, 1917.

2 SHEETS-SHEET L R. CONRADER.

COMPRESSOR. APPLICATION FILED MAY 4. I915.

2 SHEETS-SHEET 2.

Patented Sept. 11,191'22 ent r.

RUDOLPH connnnnza, or ERIE, PENNSYLVANTA.

COMPRESSOR.

.- following is a specification.

' engine cylinder, and

'pipe 5. 'It has the ,through which the valve -9 extends.

This invention relates to compressors'and consists in certain improvements in the construction thereof as will be hereinafter fully described and pointed out in the claims.

More particularly the invention relates to compressors driven by a fluid actuated motor as a steam engine and has relation to the control of this motor and the compressor.

The invention is illustrated infthe accompanying drawings as follows:

Figure 1 shows a side elevation of a compressor.

Fig. 2 a central section through a compressor governor.

Fig. 3 a view partly in section of the inlet valve of the compressor cylinder.

Fig. 4 a section on theline 44 in Fig. 3.

1 marks the steam cylinder, 2 the compressor cylinder, 3 the compressor frame, 4 the steam pipe leading from the governor to the 5 the steam supply pipe leading to the governor. The governor has the discharge opening 6 .leading to the pipe 4 and the inlet opening 7 connected with the usual diaphragm 8 The stem 10 extends upwardly from the valve 9 through a gland 11. The gland 11 is arranged in t The frame 13 extends from the plate '12. A rotating carrier 14 is journaled 1n the frame 13. Centrifugal weights 15 are journaled on the carrier 14 by means of pins 16. The carrier has the gears 17 meshin agear 18. The gear 18 is on the drive sha t 19,'which shaft is journaled in the frame 13. The governor is drivenby a pulley 20 by a belt connected with the crank shaft of the engine (not shown) in the usual manner. Links 21 connect the weights 15 with the head 22. The head 22 is on the spindle 23.

The spindle 23 extends into a step block 24.-

A lever 25 extends into the slot 26 in the block 24. The lever is journaled on a pm 27 secured in the frame 13, The end of the lever 25 engages a shoulder 28 on a rod 29.

' The rod 29 extends upwardly through a frame 30. It has a small nut 31 at its upper end. Springs 32 and 33 are arrange e- Patent #775,391.

e top plate 12 of the governor;

App1ieatioizfi IedMay4, 1915. Serial No. 25,856.

tween the shoulder 34 and an adjusting-nut '35 the upper end of the frame 30. These springs form the centripetal element of the governorand the weights 15 the centrifugal element of the governor and follow in general arrangement the governor shown in my A stem 36 extends downwardly from the frame and is stepped ina piston 37. The piston operates in a cylinder 38. The movement of the piston is opposed by a counterpressure device involving the springs 39 which are secured to the frame and the yoke 40 at the bottom of the cylinder. These operate in the manner of the patent referred to.

In order to intensify pressure in the receiver communicated to the piston 37 I provide the following mechanismi The receiver of dis charge of the compressor is connected at 41 with is arranged in the cylinder 42. A valve 44 is carried by the piston 43 and operates in a valveopening 45 connecting the cylinder 42 with the intensifying chamber 38. A stem 46 extends outwardly from the piston 43 130 a lever 47. The lever 47 is pivoted on a pin 48 extending from a frame on the cylinder 42. The lever 49 extends from the lever 47 formin a bell crank therewith and a weight 50 is adjiustably mounted on the lever 49. A spring 51 is secured on a hook 52 extending from the cylinder 42 and is ad uStably secured to the lever 47 by meansiof' an eye the changes of air as such changes are with relation to the weight. A minute leak' 54 is provided for the chamber 38.

When the pressure reaches the desired amount, it operates the piston 43 opening the valve 44. The initial pressure in the chamber 38 is atmospheric pressure. As

a cylinder 42. A controlling piston 43 Specification of Letters Patent. P t m g m, M, 9

bolt 53. By means of the springs 51 and the valve opens, air is admitted throu l1 the passage 45 and discharges through t 1e minute opening 54.. Thus the pressure builds up in the chamber38" from atmos-' phere. When the valve 44 is fully opened, the opening 45 is so large compared with the opening 54 that substantially full receiver pressure is delivered to the chamber 38. The chamber 38 is connected with the cylinder 38 so that the pressure in the intensify-' ing chamber isthe pressure which actuates the piston 37. The resistance to the control-' ling piston is such that with a few pounds variation in thereceiveri, the piston moves the valve 44 from no opening in the receiver a great delivered to the piston 37. v

The movement of the piston 37 overcomthe counterpressure springs I 39 raises the springs 33 and s the frame untensioning '32, thus reducing the centripetal element of the governor and thus changing and reducing the-normal speed of the governor., As

compressor.

.- the piston returns under the It is desirable with some compressors to have the same range of governor-control, that is, starting at the maximum speed to bring the compressor down to some lower speed and it is desirable to control this lower speed depending on and conditions in the installation of the To accomplish this is one of the principal purposes of this invention.

pipe 55 extends from the intensifying chamber 58 to a pressure controlled valve 56. Pipes 57 extend from the pressure controlled valve to the. inlet valve ends 38 of the compression cylinder. These valve ends have a motor piston 59. Inlet valves 60 are provided with the stems 61 which extend through the spiders 62. The stems have the shoulders 63. Springs 64 are arranged between theshoulders and spiders, the springs tending to close the valve. When pressure is delivered to the chamber 58 in the valve end and operating on the piston 59, the piston contacts the end of the valve stem 61 and lifts the valve 60 from its seat and retains it in this position so that as the piston in the pressure cylinder reci ply moved into and out o the compressor or from end to end of the compressor through the passage 65. This device is commonly termed a relief device or unloader.

The pressure actuated valve 56 has a cylinder 56 from which extend the ways 66 into the pipes 57. An annular groove 67 extends around the cylinder 56 in register with the ways 66. It communicates with a minute discharge opening 68. A piston valve 69 is arranged in the cylinder 56 and. in its upper positioncloses the upper end of the cylinder which is connected withthe pipe,55 so as to cut off" communication beto full opening so that with this variation of a pounds pressure range or variation in range of pressure is conditions of service.

with pressure rocates air is Sim-- tween the pipes 57 and pipe 55. With the piston in thisupper position, air may discharge from the pipes '57 through the wa'ys.56 roove 67 and minute opening 68. A spring 0 is arranged under the piston 69 in'the cylinder 56. An adjusting screw 71 is provided for adjusting the spring. By adjusting sired may be given to the cylinder 56.

In theoperation of the device when the compressor has been brought down under the control of the governor to as low a speed I as is desired, the resistance of the spring 70 being properly adjusted permits a movement of the piston 69 under this pressure so as to uncover the ways 66. The air is, therefore, delivered from the intensifying chamber 38, pipe 55, through the pressure controlled valve 66, pipes 57 to the unloaders and the compressor is unloaded. When the pressure in the receiver drops and the pressure in the intensifying chamber drops sufficiently, the piston 69 returns under the influence of the spring 70 thus closing off the air and allowing the piston 59 to return and the compressor to load up.- By connecting the valves at the end of the cylinder and arranging the minute leak in this connection cutting off all the rest of the. pipe except the pipe connecting the valve, of pipe has .a very small volume of air to discharge so that there is no extended retardation in the loading up. It can be more readily controlled by eontrolling the size of the passage 68. By operating the unloaders from the intensifying chamber they are operated by a reduced air pressure and, therefore, the discharge can be more conveniently handled. Further the wide range of pressure in the intensifying chamber makes the adjustment of the speed at which the compressor is unloaded a very delicate and very sensitive one.

What I claim as new is 1. In a compressor, the combination of-a fluid, actuated motor; a compressor cylinthe screw 71 any resistance de-' this small length der; a valve on each end of said compressor cylinder; a governor for said motor having 1 centrifugal and centripetal elements; means actuated by the pumped fluid for changing the normal speed of the governor; unloaders operating on said valves; a connection between said unloaders and said means; and a pressure controlled valve in said connection adjacent to the unloaders.

, 2. In a compressor, the combination of a uid actuated motor; a compressor cylinder; a valve on each end of saidcom ressor cylinder; a governor for said motor aving centrifugal and centripetal elements means actuated by the pumped fluid for changing the normal speed'of the governor; unloaders operating on said-valves; a connection between said unloaders and saidmeans, a pressure controlled valve in said connection adjacent to the unloaders; and means for adjusting said valve to act at difl erent pressures.

3. In a compressor, the combination of a fluid actuated motor; a compressor cylinder; an unloader for said cylinder; a pressure governor for said motor having centrifugal and centripetal elements; means actuated by the pumped fluid for changing the normal speed of the governor; an intensifying device for intensifying the changes of pressure in such pumped fluid; a connection between the intensifying device and the unloader; and a pressure actuated valve in said connection.

4. In a compressor, the combination of a fluid actuated motor; a compressor cylinder; an unloader for said cylinder; a pressure governor for said motor having centrifugal and centripetal elements; means actuated by the pumped fluid for changing the normal speed of the governor; an intensifying device for intensifying the changes of pressure in such pumped fluid; a connection betweenthe intensifying device and the unloader; a pressure actuated valve in said connectlon; andmeans for ad ust1ng S316.

pressure actuated valve.

5. In a compressor, the combination of a fluid actuated motor; av compressor cylinder; valves on each end of said compressor cylinder; unloaders operating on said valves; a connection between said unloaders having a minute discharge; a pressure controlled valve in said connection, said valve comprising a cylinder having Ways leading to said connection; a piston adapted to open and close said Ways, said piston being subjected to pressure; and means for resisting the movement of said piston.

a 6. In a compressor, the combination of a fluid actuated motor; a compressor cylinder; valves on each end of said compressor cylinder; unloaders operating on said valves; a connection between said unloaders having a minute discharge; a pressure controlled valve in said connection, said valve comprising a cylinder having Ways leading to said connection; a piston adapted to open and close said Ways, said piston being subjected to pressure; and means for resisting the movement of said piston comprising a spring; and means for adjusting said spring.

In testimony whereof I have hereunto set my hand in the presence of two subscribing wltnesses.

RUDOLPH CONRADER. 

